Thats correct. And a prime example of this is during the winter, your car will get worse fuel milage. Maybe not much, but it will. Where as in the summer, it will get better fuel milage. My truck for example will get 7.2 MPG in the summer, and 6.4 in the winter. The density of the air directly affects fuel milage. And density is a direct affect of temps.

EXACTLY.  The air is more oxygen concentrated in the winter cold, therefore, there needs to be a richer fuel mixture to remedy this.  The air is less oxygen concentrated in the summer, so a leaner fuel mixture is required in the summer.  Generally, the hotter the temps, the less fuel is required, therefore you will get better gas mileage in the summer, and in the winter- vice versa.

I'm not picking a fight or an argument ,but for the record , I never said it was 600 dg at the intake , that would be crazy as was stated , and as far as my theory on fuel consumption , I could be wrong , my motor was extremely tired (177,000 mi) when I started noticing this so that could have a  lot  to do with it , but ar we 100% sure that all the knock sensor adjust is timing and  boost control? What if that is not enough to cool down the cylinders?How much can it really back off the timing without taking away too much power? Is the ECU really just relying on the CTS for input or do several other sensors come into play , including the knock sensor? I believe they all come into play.The knock sensor is smarter then you think ,it not only controls timing it also shortens the injector pulse width and increases the duration.Think about it for a second , if it has to cool the top of the pistons, the intake and exhaust valves , and the combustion chamber , can it really cool it down enough just by retarding the timing and lowering the boost? I strongly believe that too much heat is not a good thing.Also for the record I did not compare winter fuel economy to summer.It was more of a spring to hot humid NY summer comparison.Once again I'm not trying to be insulting ,I just want to voice my opinion and here yours so we can all learn from each other.I have a lot of respect for this thread , the info supplied from it , and the work I've seen some of you guys to these rare breeds.I've seen the pics and it has inspired me.That is why I decide to keep her and rebuild her , I think she is worth it and I just want the best for her LOL.

You are not making anyone mad or not showing respect...I just have an abrasive sound when people read what I type because I stick to the facts. Do not take it personal...just most on here have learned that about me and do not take what they read from me to them to heart.

Now as far as the ECU telling the injectors to fatten the mixture when it senses knock. Please tell me what line in the code for the LG5 says that?